Work efficiency and pipes-and-cisterns problems.
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Q1 · Time and Work · EASY
A can complete a work in 12 days and B can complete the same work in 18 days. If both work together, in how many days will they complete the work?
Q2 · Time and Work · EASY
15 men can complete a work in 20 days. How many men are required to complete the same work in 12 days?
Q3 · Time and Work · MEDIUM
A pipe can fill a tank in 6 hours. Another pipe can empty the full tank in 10 hours. If both pipes are opened together when the tank is empty, in how many hours will the tank be filled?
Q4 · Time and Work · MEDIUM
A and B can do a piece of work in 12 days, B and C can do it in 15 days, and C and A can do it in 20 days. In how many days can A alone complete the work?
Q5 · Time and Work · HARD
A can complete a work in 15 days. He worked for 5 days and then B joined him. They completed the remaining work in 4 days. In how many days can B alone complete the entire work?